She live-streamed the protest on Facebook, and wrote: “The London event is a direct response to the Edinburgh bus company refusing to run the dictionary definition signs and the billboard being removed in Liverpool.

'Attack on womanhood'

“Standing for Women is a very targeted and focussed campaign, we are seeking to draw into the public sphere the devious and pernicious attack on womanhood.

“We would like the public to understand that language about womanhood is being outlawed and erased; women who speak up are being criminalised; trusted institutions like the police, the NHS, Education, government have already fallen.

“The likes of the BBC have chosen their side, they have chosen to manipulate the population and attempt to lead it as opposed to being lead. Art is no longer reflecting life but hoping to coerce the population without honesty, transparency or consultation.”

Keen-Minshull also shared a link to an article from the Times saying that BBC staff had been told to use gender-neutral pronouns like ‘they’ and ‘them’ rather than ‘he’ or ‘she’, and said: “This is why the BBC was a target”.

Transphobia accusations

Her campaign, Standing for Woman, is against the proposed changes to the Gender Recognition Act, that would make it easier for transgender people to obtain legal documentation in the gender they live as.

The Liverpool poster was removed after complaints of transphobia, including from Dr Adrian Harrop, who called the campaign “a transphobic hate group”.

Keen-Minshull previously told talkRADIO’s Matthew Wright: ““It’s about time women were allowed to assert our own boundaries and the first and foremost boundary is language that protects us and is about is. It does mean adult human female, and it doesn’t mean anything else.”

When asked by co-host Daisy McAndrew if that mean people who’d had a “sex change” could call themselves women, or if she was only referring to people who have a penis, she responded: “I don’t think changing sex is actually possible”.

Keen-Minshull has also been accused of Islamophobia by her opponents, after a tweet in May where she said “we are at a time when you can offend everyone except Muslims and trans women”.

The BBC, the National Gallery and the Royal Opera House have been contacted for comment.